BOMBARDIER BD-100-1A10, Operating Manual

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ICE AND RAIN PROTECTION
Volume 2 Flight Crew Operating Manual Sep 13/2004
14-01-02
CSP 100-6
REV 1
ICE DETECTION SYSTEM
DESCRIPTION
The Challenger 300 has two ice detectors, one on each side of the fuselage just above the nose landing gear doors. Each
detector is supplied with 28 VDC and continuously monitors internal circuits and components for failure conditions.
COMPONENTS AND OPERATION
The ice detector uses a vibrating probe to detect the presence of icing conditions. Two detectors provide system redundan-
cy; only one signal is needed to generate an EICAS message.
The ice detector probes vibrates at high frequency. As the ice detector enters an icing environment, ice collects on the sens-
ing probe causing the frequency of the sensing probe to decrease. At the same time the ice detector de-ices the unit strut
and probe through internal thermal heaters. Shedding the ice on the probe returns the vibration frequency of the probe to a
non-icing value that allows the detection system to reassess if ice is accumulating. When the ice is removed, the heaters are
de-energized. As ice builds again on the probe, the heater are reenergized and the process is repeated.
When ice is detected the following will occur:
- An amber ice icon is displayed on the PFD if the anti-ice systems are off
- An ICE DETECTED (C) CAS message is displayed if the anti-ice systems are off
- An ICE DETECTED (A) CAS is displayed if the anti-ice systems are on
A caution ICE DETECTOR FAIL is displayed on the EICAS when both ice detectors have failed. An advisory ICE DE-
TECTOR FAULT is displayed on the EICAS when one of the ice detectors is failed.
Each ice detector is provided with a power on test capability as well as a continuous built in and pilot initiated test capa-
bility. To initiate a test of the system, select ICE DET on the SYSTEMS TEST panel and push the test switch. During the
test sequence, an internal check of the electronics, probe heater, and CAS messages will be performed.
CF
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1401002_00
4
ELECTRICAL
CONNECTOR
MOUNTING
FLANGE
STRUT
VIBRATING
PROBE